Improvement in fire-damper regulators



PATENT OFFICE.

PHILIP LAMB, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN Hai-:-

DAM PER REGULATORS.

Specification formi-ng part of Letters Patent No. 43,2] 3, dated June 21, 1864.

To @ZZ whom it may concern:

Beit known that I, PHILIP LAMB, of the city of San Francisco, in the county of San Francisco and State of California, have invented a new and Improved Damper-Regulator for Steam-Boiler Furnaces; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, said drawing representing a central vertical section ofthe regulator.

My im proved damper-regulator is composed principally of a cylinder, a piston, and a spring, the cylinder receiving steam at one end from the boiler to act upon the piston, which is arranged within it, the piston being connected by a crank with the damper and the spring being applied within the cylinder to act upon the piston in opposition to the pressure of the steam, which tends to move it in a direction to close the damper.

To enable others skilled in the art to make and use my i1'1ventioI1,I will proceed to describe it with reference to the drawing.

A is the cylinder, andB the piston, fitted to work steam-tight therein, and having its rod b working through a guide in the opposite end of the cylinder to that where the steampipe a, from the boiler is connected.

C is the spring coiled around the piston-rod and tending to push 'the piston toward the pipe a( One end of this spring bears against the piston, and the other against a disk, G, which is fitted to slide on the piston-rod, and which bears against the inner end of a hollow screw, H, which is screwed into the cylinderhead, and which serves to adjust the strength ofthe spring. This screw is made hollow to constitute the guide for the piston-rod.

D is the damper, having rigidly attached to its spindle c the crank E, which is connected with the piston-rod b by means of a rod, F.

The damper-connection is so arranged that the damper is wide open when there is no pressure in the boiler. The strength of the spring is so adjusted by the screw H that the steam entering the cylinder from the boiler will not move the piston till there is a certain amount of pressuresay about ten pounds per square inch-in the boiler and cylinder, and as the pressure rises above this it commences to move the piston, and thereby to compress the spring and move the damper toward its closed position, contracting the opening ot' the latter and reducing the draft ofthe chimney as the pressure continues to increase. If the pressure of the steam diminishes, the spring overcomes the pressure of the. steam on the piston and moves the latter back, thereby causing the opening of the damper to be'increased and a consequent increase of the draft of the chimney, and in this way the combustion is regulated and the pressure in the boiler is kept nearly uniform.

The connection of the rod F with the crank E is made adjustable in a slot, @,in the crank for the purpose of making the piston have a greater or less effect upon the damper.. When an increased draft is required, the connection is shifted in the slot farther from the spindle c of the damper, and the movement of the piston will have less effect on the damper, and vice versa.

What I claim as my invention, and desire to secure by Letters Patent, is-

The arrangement of the spring C., springadjuster H, piston rod F, piston B, steamcylinder A, steam-pi pe d, and slotted damperarm E, all as herein specied, and for the purpose set forth.

PHILIP LAMB. 

